Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc82b6ddb033d60…

MALICIOUS

PDF

70.4 KB Created: 2020-11-14 10:42:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: cf7e93a55b461a00d0e0e3bedd9420ec SHA-1: 62228ce99e9bc4e0809adb151e23511f5232aefe SHA-256: bcc82b6ddb033d6032b7e35cf8dae6f8e5a64a40f47fb135dcd23a933f5a26de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, such as 'https://trafftec.ru/123?utm_term=what+a+wonderful+world+sam+cooke+cover', suggests a phishing or SEO spam campaign. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafftec.ru/123?utm_term=what+a+wonderful+world+sam+cooke+cover PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381289/normal_5f8bdd05d2e24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401694/normal_5fa823ba6968a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387218/normal_5f8cc3355183e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409616/normal_5f96ba3b3f33a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375509/normal_5fa2f7c7f29d9.pdfIn PDF document text
    • https://kogewovedof.weebly.com/uploads/1/3/4/3/134339257/1f199489f.pdfIn PDF document text
    • https://pofexetebi.weebly.com/uploads/1/3/4/5/134592759/2125121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496389/normal_5fab809b2ffe1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e70e338e-f8dc-4ae4-ad60-c7c25e7cdbb1/pugogabuvexokumiwitinig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3e02f12-cdf9-46d8-b1ff-c683684522d4/sunegexe.pdfIn PDF document text
    • https://s3.amazonaws.com/zokokamu/section_3_guided_reading_and_review_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/guvonukijugimumezu.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/technical_communication_today_4th_edition.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD464 5492 bytes
SHA-256: 0e05f9d4d3aa539f90fd6a62a8878f82df12e3beabb43ca16b366c9a99213d59
font_01_sfnt_off0000e703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE703 10900 bytes
SHA-256: 554134bd114425acf7053c062e0e2c3d6bcd534d6c3225ea66113c225650358f

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